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Quenched-tempered heat treatment method for bearing sleeve machining

A quenching and tempering heat treatment and bearing sleeve technology, which is applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems that the hardness of bearing sleeves cannot meet the requirements, reduce the service life of bearing sleeves, and the hardness of bearing sleeves is not high. Fracture, prolong service life, improve the effect of quenching quality

Inactive Publication Date: 2017-11-24
ANHUI BUERYUE BEARING
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Problems solved by technology

[0002] With the improvement of the industrial level, the use of bearings is particularly widespread, especially the current bearing sleeves are subject to increasing requirements, so the requirements for the hardness of the bearing sleeves are relatively high, which requires the bearing sleeves. The internal structure is improved, but the currently used bearing sleeves generally have the disadvantages of low hardness and low wear resistance. In view of the continuous increase in the current work intensity, the hardness of the original bearing sleeves cannot meet the required hardness, resulting in The bearing sleeve is twisted and worn to a large extent during high-intensity work, which seriously affects the accuracy of the bearing sleeve and reduces the service life of the bearing sleeve

Method used

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Embodiment Construction

[0017] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below.

[0018] A quenching and tempering heat treatment method for bearing sleeve processing, the steps of the heat treatment method are:

[0019] (1) Preheating treatment. The material of the bearing sleeve used in processing is 20CrMnTi steel. Preheat the previously rough-processed bearing sleeve to 350°C and keep it at a constant temperature for 30 minutes;

[0020] (2) The bearing sleeve is normalized and heated, and the bearing sleeve after the preheating in step 1 is further heated to 800°C for the second time, and then the temperature of the bearing sleeve after reaching the temperature is maintained for 3 hours, and the bearing is heated by multi-stage heating during processing. cover for heating;

[0021] (3) Quenching and cooling treatment. Take out the bearing sleeve heated by high temper...

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Abstract

The invention aims to provide a quenched-tempered heat treatment method for bearing sleeve machining. The heat treatment method comprises the steps that (1) pre-heating treatment is carried out, specifically, a bearing sleeve used in the machining process is made from 20CrMnTi steel, the rough-machined bearing sleeve is preheated to 350 DEG C, and heat preservation is carried out for 30 minutes at a constant temperature; (2) normalizing heating is carried out on the bearing sleeve, specifically, the bearing sleeve which is pre-heated in the step 1 is further subjected to secondary heating to reach 800 DEG C; (3) quenching and cooling treatment is carried out, specifically, cold water is firstly sprayed on the surface of the high-temperature bearing sleeve to carry out cold water cooling, when the temperature of the bearing sleeve is decreased to 530 DEG C, water spraying is stopped, and then the bearing sleeve is immersed into oil for secondary cooling and then is placed in air to be air-cooled to 120 DEG C; and (4) high-temperature tempering treatment is carried out. The method has the advantages that the temperature reduction speed in the quenching process can be decreased, the temperature difference between inside and outside of the bearing sleeve can be reduced, the surface fracture in the quenching process can be avoided, the quenching quality can be improved, and the hardness and the surface wear resistance of the bearing sleeve can be improved.

Description

technical field [0001] The invention relates to the field of the processing technology of the bearing sleeve, in particular to the improvement of the heat treatment of the bearing sleeve, and in particular to a quenching and tempering heat treatment method for the processing of the bearing sleeve. Background technique [0002] With the improvement of the industrial level, the use of bearings is particularly widespread, especially the current bearing sleeves are subject to increasing requirements, so the requirements for the hardness of the bearing sleeves are relatively high, which requires the bearing sleeves. The internal structure is improved, but the currently used bearing sleeves generally have the disadvantages of low hardness and low wear resistance. In view of the continuous increase in the current work intensity, the hardness of the original bearing sleeves cannot meet the required hardness, resulting in The bearing sleeve is twisted and worn to a large extent durin...

Claims

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Application Information

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IPC IPC(8): C21D9/40C21D1/25C21D1/28C21D1/18
CPCC21D1/18C21D1/25C21D1/28C21D9/40
Inventor 王胜松
Owner ANHUI BUERYUE BEARING
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